Optics: measuring and testing – By dispersed light spectroscopy – With raman type light scattering
Patent
1995-06-20
1997-07-01
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
With raman type light scattering
356305, 356328, G01J 318, G01J 344
Patent
active
056443960
ABSTRACT:
A spectrograph having a collimating lens unit, a reflective diffraction grating, a focusing lens unit, and a light detector is provided. The collimating lens unit has at least one optical element with at least one aspheric surface for collimating light from a light source. This lens unit has a positive optical power and a focal ratio of at most 1.7. The reflective diffraction grating diffracts the collimated light from the collimating lens unit. The focusing lens unit also has at least one lens with at least one aspheric surface. It focuses the first order diffracted light on the light detector and has a focal length that provides an overall magnification of 0.8 to 2.0 when combined with the collimating lens unit and the diffraction grating.
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Evans F. L.
Hewlett--Packard Company
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